Search results for "56"
showing 10 items of 1818 documents
Preliminary photochemical studies of fluorene in various aqueous media
2014
- The current study investigates the direct photochemical degradation of aqueous fluorene with the aid of a 125W polychromatic medium, pressure Hg lamp. The purpose was to test the effectiveness of the lamp in irradiation using fluorene spiked solution as substrate. A 700 ml volume of fluorene solution of 0.002 mg/l was irradiated batch-wise at 1, 3, 6, 12, 18, 24 and 48 h. The amount of fluorene removal was studied for fluorene solutions prepared from , neutral (distilled water), acidic (by adjusting pH with hydrochloric acid, HCl), basic (by adjusting pH with sodium hydroxide, NaOH) and saline (addition of sodium chloride, NaCl) solutions and there was 95.95, 92.35, 96.65 and 97.15 % remo…
Near infrared spectroscopic study on the adsorption of methanol on silica gel
2013
Author's version of an article in the journal: Advanced Materials Research. Also available from the publisher at: http://dx.doi.org/10.4028/www.scientific.net/AMR.650.150 The silanol groups on Silica gel surface are sites for adsorption of polar molecules. Alcohols and other polar molecules are easily adsorbed by forming hydrogen bondings with OH groups on silica gel surface. A study on the adsorption of methanol on silica gel was carried out by using NIR spectroscopy in combination with ssecond derivative techniques. Four of the well characterised silica gel samples were used in this study. Each of the silica gel (0.25g) samples with different surface areas and silanol number was pressed i…
Characterization of coating on graphite anode material for lithium-ion batteries
2021
Master's thesis in Renewable energy (ENE500) To improve the performance of lithium-ion batteries, the graphite anode can be treated with special coating. Thus the charge transfer resistance through the material can be lowered and thereby enable e.g. faster charging. The amount of coating is essential the improve the performance. The thesis is investigating thermogravimetric and electrochemical impedance spectroscopy as a method to identify an optimal relation between the amount of coating and the charge transfer resistance. There is found that lower material resistivity gives a higher weight loss where it is assumed that the coating is oxidising, methods for both a relative difference in th…
Ammonia Fuelled Solid Oxide Fuel Cell to Power Maritime Applications
2021
Master's thesis in Renewable energy (ENE500) Ammonia fuelled solid oxide fuel cell (SOFC) systems are regarded as a promising alternative for energy production due to high efficiency and low environmental impact. Ammonia is a carbon free compound with high energy density, low production cost and much simpler transport-and storage properties than hydrogen. The state-of-the-art SOFC contains a Ni/YSZ anode which has proven to be an effective catalyst to crack ammonia at intermediate temperatures (∼700°C). In this study an experimental work was conducted using an Open Flange SOFC test set-up with a planar anode-supported single cell consisting of a Ni/YSZ anode, YSZ electrolyte, and LSM cathod…
Preparation and Characterization of Spherical Nickel Silicide Powder by Inductively Coupled Plasma Spheroidization for Additive Manufacturing
2022
Author's accepted manuscript Metal alloy powder with spherical-shaped morphology, high flowability, and packing density is the main requirements for metal-based additive manufacturing (AM). Among metal alloys, nickel silicide is considered as a potential candidate due to its unique properties such as high melting point, good electrical conductivity, as well as high corrosion and wear resistance. However, the fabrication of spherical nickel silicide powder has proven to be a challenging task. In the present work, spherical NiSi16 alloy powders were synthesized by inductively coupled plasma spheroidization (ICPS). The influence of the feed rate on the properties of the as-prepared powder was …
El laberinto de la sucesión de estados respecto de los tratados internacionales sobre derechos humanos
2021
This Article analyses the effects of succession of States in respect of international treaties on human rights. This is a matter not codified by the Vienna Convention on Succession of States in respect of Treaties. We have to bear in mind that human rights treaties have been adopted by international organisations, which have developed their own practice both for the succession of States as States Members of an international organisation and for the succession of States as Contracting Parties to treaties that the United Nations, the Council of Europe or the European Union have adopted in the field of human rights.
Attraction factors of shopping centers: Effects of design and eco-natural environment on intention to visit
2017
Purpose People visit malls not only to buy a product they need but also to enjoy the atmosphere or environment of the shopping center. Based on design and eco-natural environment, the purpose of this paper is to analyze the attraction factors of shopping centers. Design/methodology/approach The sample comprised 449 consumers from 25 different shopping centers in Bogota. The structural equation model (AMOS) enables the authors to discuss the influence of the design of green and natural spaces in the commercial management of shopping centers, given its positive and significant effect on the intention to visit. Findings Shopping centers are, by definition, spaces with a high level of design o…
Identification and evaluation of antimicrobial resistance of enterococci isolated from raw ewes’ and cows’ milk collected in western Sicily: a prelim…
2019
The present work was carried out to investigate the Antimicrobial Resistance (AMR) of enterococci isolated from raw ewes’ and cows’ milk. The samples were collected from eighteen semi-extensive dairy sheep and cow farms throughout western Sicily. Plate counts, carried out on Rapid Enterococcus Agar commonly used to detect food enterococci, revealed a maximal enterococcal concentration of approximately 4.58 Log Colony Forming Unit (CFU)/mL. Colonies were isolated and differentiated based on genetic analysis by Randomly Amplified Polymorphic DNA (RAPD)-PCR. Thirty-eight different strains were identified. Analysis by a species-specific multiplex PCR assay grouped the strains into three Enteroc…
Pētera Šmita sarakste ar latviešu un lietuviešu filologu, etnogrāfu Eduardu Volteri
1915
Vēstulē P. Šmits skaidro jēdzienu "krusta priedes", kā arī piemin E. Voltera pārizdoto veco Katehismu (Латышскій катехизисъ 1585 года / переизданный Э.А. Вольтеромъ. Петроградъ : тип. Акад. наук, 1915)ю
Obtaining and Characterisation of Starch-Based Edible Films Incorporating Honey, Propolis and Bee Bread
2019
Abstract This research investigates the physical-chemical, sensorial and mechanical characteristics of starch-based edible films incorporating three types of bee hive products: honey, propolis and bee bread, in concentrations varying from 1% to 3%, reported to starch. The results indicates an increasing of films moisture, water activity, ash content and acidity, in the order: honey<propolis<bee bread, all values increasing with the increasing of hive products percentage into the control film; aw is remaining at very low values, under 0.4. Sensorial analysis indicated honey as the better suited for improving taste and flavour and bee bread for increasing colour intensity of the films; …